Exotic hadrons made of five quarks (pentaquarks) are searched for in hadronic Z decays collected by the ALEPH detector at LEP. No significant signal is observed. At 95% C.L., upper limits are set on the production rates N of such particles and their charge-conjugate state per Z decay: N(Xi(1862)) (.) BR(Xi(1862)(--) --> Xi(-pi-)) < 4.5 x 10(-4), N(Xi(1862)0) (.) BR(Xi(1862)(0) <8.9 x 10(-4), N(Thetac(3100)0) BR(Theta(c)(3100)(0) D*(-)p) < 6.3 x 10(-4), N(Thetac(3100)0) (.) BR(Theta(c)(3100)(0) --> D(-) p) < 31 X 10(-4). (C) 2004 Elsevier B.V. All rights reserved.
Search for pentaquark states in Z decays
TRICOMI, Alessia Rita
2004-01-01
Abstract
Exotic hadrons made of five quarks (pentaquarks) are searched for in hadronic Z decays collected by the ALEPH detector at LEP. No significant signal is observed. At 95% C.L., upper limits are set on the production rates N of such particles and their charge-conjugate state per Z decay: N(Xi(1862)) (.) BR(Xi(1862)(--) --> Xi(-pi-)) < 4.5 x 10(-4), N(Xi(1862)0) (.) BR(Xi(1862)(0) <8.9 x 10(-4), N(Thetac(3100)0) BR(Theta(c)(3100)(0) D*(-)p) < 6.3 x 10(-4), N(Thetac(3100)0) (.) BR(Theta(c)(3100)(0) --> D(-) p) < 31 X 10(-4). (C) 2004 Elsevier B.V. All rights reserved.File in questo prodotto:
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